Proceedings PaperCW periodically poled LiNbO3 optical parametric oscillator model with strong idler absorption
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An analytical model is described for predicting the gain and performance of cw, singly resonant, optical parametric oscillators with strong idler absorption, strong pump depletion and thermally induced dephasing. Pump and signal beam focusing effects are included by using the Guha, Wu and Falk hsm parameters. It is shown that significant parametric gain can be generated with an idler absorption- length product exceeding 10, and in some cases idler absorption is seen to enhance the pump depletion by impeding back conversion. The model accurately predicts current experimental results with weak idler absorption, and greatly over predicts the performance with high idler absorption. This difference is believed to be due to thermally induced focus that strongly disturbs the resonant optical cavity for the signal. Shorter crystal lengths, with resonant pump enhancement, offers a possible solution.